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Author: WisdomAugust

Digital Multimeter HDM3055 Series Manual

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 Author| Post time 2023-9-6 08:35:30 | Show all posts
In Probe Hold mode, the instrument optimizes measurement settings to allow reliable detection of
stable signals (these settings are restored to their original values when you exit Probe Hold.) When
you probe a signal, the instrument beeps (if the beeper is enabled) and automatically records a
measurement when it finds a series of stable readings. You may take additional readings without
pressing [Probe Hold] again.

Press Remove Last to remove the last reading from the list. Press Clear List to remove all
readings from the list.

Because the Probe Hold display is optimized for the Probe Hold readings, you may not combine
it with other display modes, such as histogram, bar graph, trend chart, or statistics.
Probe Hold is a front panel only function. Readings recorded in Probe Hold mode cannot be
accessed from remote. You can, however, take a screen capture of the probe hold display,
see Utility Menu - Manage Files for details.


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 Author| Post time 2023-9-7 08:22:11 | Show all posts
Math - Introduction
The [Math] key is the shifted [Null]:

These math functions are available:
Null
l dB/dBm Scaling
l Statistics
l Limits


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 Author| Post time 2023-9-8 09:14:33 | Show all posts
Math - Null
A null reading is a value that is subtracted from all subsequent measurements. The value is specific
to the present function and will persist even if you leave this function and return to it later.

One common use of this feature is to remove lead resistance from a resistance measurement. To do
this, simply short the test leads together and press [Null]. For other measurement functions, place
the probes across a null value circuit before pressing [Null].

You can also specify a null value by pressing [Math], changing the first softkey to Value, and entering
the value using the arrow keys. To turn off the null feature, press [Null] again or press [Math] and set
the first softkey to Off.



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 Author| Post time 2023-9-9 08:17:15 | Show all posts
Math - dB/dBm Scaling
The dB and dBm scaling functions, which apply to ACV and DCV measurements only, allow you
to scale measurements relative to a reference value.
NOTE Scaling is set to OFF when you change measurement functions (for example, changing
from DCV to ACV). You must re-enable scaling after changing measurement functions.
Front Panel Menus
The dB and dBm functions are accessed from the second softkey in the [Math] menu.



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 Author| Post time 2023-9-11 08:23:14 | Show all posts
NOTE For accurate displayed statistics of AC measurements in Front Panel mode, the default
manual trigger delay
([Acquire] > Delay Man) must be used.
The first softkey on this menu (shown below) hides or shows the statistics below the data display
(number, bar meter, trend chart, or histogram).



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 Author| Post time 2023-9-12 08:08:14 | Show all posts
Remarks
l The Span value is the Max minus the Min.
l Press Clear Readings to clear reading memory and re-start statistics calculation.
Math - Limits
Limit checking indicates how many samples have exceeded specified limits and visually indicates when
the limits are exceeded.
Front Panel Menus
The limits menu is accessed from the [Math] menu.



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 Author| Post time 2023-9-13 08:12:00 | Show all posts
The first softkey enables or disables limits. The second and third softkeys specify the limits either
as high and low values or as a span around a center value. For example, a Low limit of -4 V and
a High limit of +7 V are equivalent to a Center of 1.5 V and a Span of 11 V.



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 Author| Post time 2023-9-14 08:28:08 | Show all posts

The Beeper softkey enables or disables beeping when limits are violated (this also enables or
disables the beeper for the other functions that use the beeper - probe hold, diode, continuity,
and errors. Clear Condition resets the limit borders to green, as described below.


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 Author| Post time 2023-9-15 08:13:52 | Show all posts
Limit Indications
The display uses colors to indicate limits and limit violations.
Trend Chart
The limit area is shown in light red on the graph. The limit borders are green (shown below) as long
as the limits have not been exceeded.



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 Author| Post time 2023-9-18 08:28:00 | Show all posts
When a limit is exceeded, the border turns red. In the image below, the top border is still green,
but the bottom border has changed to red because the trend line has gone into the lower limit area.



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